Our instrument is a three octave instrument. So... that means you are going to have three C's, three D's etc. somewhere on your neck.
I look upon standard notation as having three locations for the notes - lower ledger notes - the one below the staff. Middle staff notes - the notes within the staff. And then upper ledger notes - those above the staff.
Look at your music and how much do you have of each? Then decide where you are going to be able to find those notes - in a cluster - on your fretboard. Play them from there.
Go here
http://www.studybass.com/lessons/reading-music/bass-clef-fretboard-notes/ then click on the Bass Clef notes on the fretboard PDF. and you will find that the place is probably in the middle of your fretboard. But the old guys are telling you to grab your notes up around the nut, what is a guy to do? Do what the instructor you are going to get tells you. There are a number of ways to attack your original question. You may end up not even playing from standard notations, but, instead use fake chord sheet music and play the notes of the chords that are active - at this moment - in the song.
Until you get your instructor try this Internet site
www.studybass.com and of course ask specific questions here, someone will always help.
Welcome to the bottom end.